[?]: Fanuc PLC problem - program gone with/without battery

[naesrkargar]

I have PLC fanuc 90 30 , when i remove power from PLC all program inside the PLC gone! and need to load program to PLC again!.
the problem is POWER Supply have a Battery to keep the program and LED of the battery is OFF hats mean battery voltage OK.
and strange is if i remove battery from P.S. the battery LED still OFF!!
and in any condition ( with battery or without battery) program gone!
Please Help me as soon as possible

[hmohamed]

hi naesrkargar

repair the power supply or replace by new one the problem will be solved

[naesrkargar]

thank you
in extension Rack i also have another P.S. and i chenged with this one and still have same problem.
-what is mean Repair P.S. which part inside P.S have problem?
-how can modify PLC to don't need Battery?how can find in the PLC i have EEPROM or not ( CPU 341)?

[hmohamed]

hi naesrkargar

i had face the same problem before but with micro not 90-30 and i asked fanuc themselves and they said uhave to update the firmware and they gave the new firmware and the cable connection if you did not solve your problem you may ask them too.

[OrionK]

These Fanuc PLCs have two types of memory - RAM and Flash. In the main module settings you are choosing where to take the logic from and where to take registers from. You can set both to flash memory and when you upload your program to PLC just upload it to flash memory. This works perfect if you don't have a battery.
Please keep in mind that flash memory cannot be erased by online command "Clear memory". So I would hardly recommend to put only the FIANAL and TESTED version into a flash memory.